74 400 Cross Engine Assembly Help?

I thought he was saying he heated the left stub while in the cases to 400deg f. If so he'll need a new left crank seal. After re reading his post, I still would not put a gear on the drive side stub if it was at that temp.

I know what you mean. When pulling the torque wrench it clicks sooner than I expect at 29lbs, but then who am I to second guess a mechanical engineer.

Me too, Crash!

So I've been mulling over what to do about my clutch assembly and getting a piston.

John Lefever says I should use the red loctite on the clutch but I'm not keen on using something that requires 500 degrees of heat to disassemble. Pretty sure DFA will agree on that. Not that I ever plan on taking this motor apart again but you never know... I wonder, what if I just put like 2 drops of the stuff on?

I've made a lock washer by cutting out slots in a spare washer & bending them to fit into the slots & then grinding those tabs to fit. Not sure I should use it though. I believe my homemade lock washer is stronger than the original by being thicker but the slots it fits into aren't very deep and I'm also concerned that with the thicker lock washer there's less thread in the nut to bolt on the clutch hub.

As I mentioned previously, I have a lot of experience with Bultacos and looking at a manual I see that their recommendation for torque on the clutch hub is 75 foot pounds. It looks like Husqvarna only specified 29 foot pounds for the 74 400CR. That seems awfully light to me & I'm wondering if maybe I should apply a bit more pressure rather than using red loctite?

I did receive notice from Vintco that they now have the 1st OS piston in stock so I guess I'll be ordering that.

Personally, I think you're complicating things. The Husky manual recommends a thread locker and a particular torque for a reason. Permatex has an orange product (25210) that claims its 3x stronger than red and it comes apart without the use of a blow torch or dynamite.

So how do you think it might be damaged? I tried reading some metallurgical treatises but the language was too technical for me. My impression is that if overheating damaged the part it will most likely be softer and more prone to wear... or maybe it'll be too brittle. Well, there's no visible damage but you've scared me enough that I've ordered a replacement on ebay.

Crash, well Damn! This is exactly what I was looking for. Thanks!